| // Copyright 2016 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package ld |
| |
| import ( |
| "cmd/internal/objabi" |
| "cmd/link/internal/sym" |
| "sort" |
| ) |
| |
| type byTypeStr []typelinkSortKey |
| |
| type typelinkSortKey struct { |
| TypeStr string |
| Type *sym.Symbol |
| } |
| |
| func (s byTypeStr) Less(i, j int) bool { return s[i].TypeStr < s[j].TypeStr } |
| func (s byTypeStr) Len() int { return len(s) } |
| func (s byTypeStr) Swap(i, j int) { s[i], s[j] = s[j], s[i] } |
| |
| // typelink generates the typelink table which is used by reflect.typelinks(). |
| // Types that should be added to the typelinks table are marked with the |
| // MakeTypelink attribute by the compiler. |
| func (ctxt *Link) typelink() { |
| typelinks := byTypeStr{} |
| for _, s := range ctxt.Syms.Allsym { |
| if s.Attr.Reachable() && s.Attr.MakeTypelink() { |
| typelinks = append(typelinks, typelinkSortKey{decodetypeStr(ctxt.Arch, s), s}) |
| } |
| } |
| sort.Sort(typelinks) |
| |
| tl := ctxt.Syms.Lookup("runtime.typelink", 0) |
| tl.Type = sym.STYPELINK |
| tl.Attr |= sym.AttrReachable | sym.AttrLocal |
| tl.Size = int64(4 * len(typelinks)) |
| tl.P = make([]byte, tl.Size) |
| tl.R = make([]sym.Reloc, len(typelinks)) |
| for i, s := range typelinks { |
| r := &tl.R[i] |
| r.Sym = s.Type |
| r.Off = int32(i * 4) |
| r.Siz = 4 |
| r.Type = objabi.R_ADDROFF |
| } |
| } |